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    <li><a href="http://dkla.gitee.io/third_assignments\13\scrolltotop.html">1</a></li>
    <li><a href="http://dkla.gitee.io/third_assignments\13\on.html">2</a></li>
    <li><a href="http://dkla.gitee.io/third_assignments\13\hide.html">3</a></li>
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